Improvement in self-sharpening plows



J. oRMIsTo'N.

P1ow.

Patented Mar, 17, 1838.

UNITED STATES PATENT OFFICE.

JOHN ORMISTON, OF CENTER TOWNSHIP, MORGAN COUNTY, OHIO.

IMPROVEMENT IN SELF-SHARPENING PLOWS.

Specification forming part of Letters Patent No. 63S, dated March 17, 1838.

To all whom fit 'may concern:

Be it known that I, JOHN OEMIsToN, of Center township, in the county of Morgan, and State of Ohio, have invented a new and useful Improvement in Plows; and I do hereby declare that the following is a full and exact description of the construction of the said plow as invented or improved-by me, reference being had to the annexed draw-ings of the same, making part of this specification.

The plow is to be made of cast-iron, with the exception of the point A and share B, which may be made of cast or wrought metal. The plow to be made in numbers-from one to tive Y numbers-three being a medium.

vmade ovaling or partly round, the six inches of each end iliade avtrue taper in form o t' a wedge from the shoulder to the point, and reduced in width from the shoulder to the point so as to be but one and one-fourth inches in width at the point. On each side of the point is an oblong indentation,cavity, or depression, to receive the end ofthe share B. Both ends of Vthe point are made alike, the advantage of which is to admit of the ends being reversed; also, to turn over without shifting ends to suit the case. The center or reduced part of the point is to be let into the side of the moldboard, it being so constructed as to admit of letting in the form of the center part of the point or nose, which is to be bound in by the landside passing on the outside,the end of the landside and the end orpointof the mold-board to terminate and match togetherso as to join the shoulder of the point and form a close The share ou the edge is to be twelve inches in lengththat is to say, the cutting partand six inches in the widest place, formed by drawing a line each way from the center to terminate at each extreme point of the share; the upper corner or part that extends back on the mold-board to be maderounding, so as not to quite form an angle or corner-that is, the corner through which a screw-bolt is to pass to secure the share to the mold-board. The upper corner of the share through which the screw passes is about three-fourths of an inch thick,.

properly graduated down. to the edge, both sides made alike, and to be indented or let into the mold-board its thickness, and form a close joint. This share is to be so constructed as to admit of being turned over and reverse ends; the side or corner next the point to be fitted into the indentation made in the sideofthe point previously mentioned. The point of the share next the furrrow is made with a right angle, as represented in Fig. 7.

The colter or cutter' G is about eight inches in length on the edge. It is a separate piece that ,is to be placed in the throat ot' the'plow, the lower end of which is to overreach the shoulder of the point about one inch, and that part to be let into the point by indenting in the same manner that the share is indented into the side, and is secured to the plow by a lock on the back side ot' the colter tted bctween the mold-board and laudside, so that by taking oft the landside the cutter can be removed andthe plow used with a broad or narnow cutter, to suit the fancy ofthe farmer. The whole is fitted to a well-proportioned moldboard and stocked in the common method.

What I claim as my invention or improvement, and which I desire to secure by Letters Patent, consists in The peculiar form and construction of the double point and mode of fastening it, as above described.

JOHN ORMISTON.

Witnesses WM. McINTosH, J. F. TALEoT'r. 

